Drawing sheet glass



Aug. 16, l927.

'J. A. REECE DRAWING SHEET G LASS `Filed May 29, 1924 2 Sheets-Sheet 1 IL I UJI

Aug. 16,1927.

J. A. REECE DRAWNG SHEET'GLASS Filed May 29. 192,4 2 sheets-sheet 2 Eff.

lietented Ang.. l

@Ollajm E TDLEEG, OH'I, A CORPORATION OE OHIO.

DBWING SHEET GLASS.

application mail Hay 29,

. tained from a 'furnace of ren eize.

Another object to no regulate and distrihnle the supply of molten ginas to the draw-pot or receptacle as to infini-e an equal liow nii glass' from-both sides into the Sheet source afd to avoid inactivity or stagnation in any part o? thereceptaele containing; the molten pool.

in the ollrurn system of drawing Sheet n: shown for example in the patent W'. Colburn, 1,248,809, granted li, lill?, the glazes-producing materiale nre meltnl ed in one end of a .rather long tenir furnace, the molten glane limiting through the settlinp and refining por tions ci the tank to opposite end Where the surface glass. tierra; into a'sliaiiow receptacle from which le sheet is drawn. Experience has shown Anatallat-ione of this type, although ie ina tank po ions may hold a hody of assi havingi; l `th ot several i'eet, only upper stratum the depth of a very A n tiene freely through the tank., r strnta tiic'inolten rieles are 5,., etically strfiognanii. Non? it ia essential that the molten gl-aes remain a certain length ot time in the tenir to iieconie properly refined before it may he sur er'nlly drawn into ahect` forni, andthe '.rface area of this t pe "et tank innert hr1-:ir auch arelat-ion to clic amount of glas drawn 'from the tanlr that the surface fla will remain in the tank for the proper rciining period. For example, if one attenti-teo to dra-W two sheets from a' iinrnei designed to draw a single Sheet, the dra. .i ci: the tank would loe such that the snrince sitraf'nni ot glass would iiow too rapidly through the furnace and would not have time to heee-ine properly 1924. Serial No. 716,565.

refined. It has been considered necessary in such cases togreatly increase the surface area of the tank 5o that the rate of flow 'for the increased output vwould still allow' all of the inohile surface glass to remain in the tank the necessary length of time.

AccordingI to this invention, the increased production is accomplished by increasing the depth and hence the volume of flow of the molten glass through thc tank. Forexample, it' the flowing stream of glass were made twice as deep as before, the Size, or `the draw-v innY ratel of the sheet could be substantially doubled without increaing the rate of How through the furnace over that` in present installations. This end is reached by withdrawing 'the molten glass, from which the sheet in subsequently forme-d, from the lower strata ot glass in the tank, thus necessitatn ing the flow ot' the lower and now inactive portionel ofthe molten glass.

In the form of the invention here disclosed, lthe shallow open container for the pool of glass from which the glass sheet is drawn upwardly, is so positioned and connected with the tank. furnace that the molten glass flowing;- into the shallow pool isr I drawn trom the .sub-stratum glass in the tank. That is, the surface glass does not. flow continuously from the tank into the shallow receptacle, hut the pool in the shallow receptacle is supplied with 'glass taken from beneath the surface of the tank.

The objects and advantages of the invention will he more clearly understood from the Jfollowing detailed description ot certain approved forms of the apparatusf v ln the accompanying; drawings:

Fig. l isn vertical longitudinal Section through rthe apparatus taken substantially on vthe lline l--l of Fig. 2.

lling. 2y is a vhorizontal section taken suhstantially on the lines 2-2 ot' Figs. l and 3.

Fi. 3 is a transverse vertical section taken substantially on the line 3-3 of Fig. 2.

Fig. 4 is a View similar to Fig. 2 of a modified form of the apparatus.

Referring first to Figs. l, 2 and'3 of the drawings, l indicates the continuous tank furnace, the molten glass' 2 being first pro- 'then carried away through drawing or the surface glass in duced in .the melting end of the furnace, not here shown but being at the right of F ig. 1, this glass iowing slowly through vthe turnace to the rening end 3 shown in the @Drawingsceptacle for the pool of molten `glass 5 from the surface of which the Glass sheet 6 is drawn upwardly. This sheetlI @is drawn up roin an exposed area of the'surface 'ol pool 5 between-aa pair of coolers 7 which chill the sheet'and sheet source tothe4 proper drawin l temperature. The sheet is bent while sti plasticabout a bending roller 8 ang ilattening mechanism 9 into the lehr. All col 5, except the cooled area from which t e sheetisdrawn, is covered and rotected by suitable covertiles l0, and tg which maintains the pool 5 at the proper tegiperature. .All of the above is substanti y as new in use and referred to in the olburn'patent referred to hereabove.

ln the installation here disclosed the conminer 4.- is positioned considerably lower vthan has heretofore 'been the caseso that the K glass level-ofshallow pool 5 will be considerably below the glass level in the tank '1. In

"the forni disclosed in Figs. 1,*and 3, the

container-#alie made .somewhat wider than tlieglassl eet 6 to provide for glass passages .l-at' the" sides of the sheet forming area. '.Lli'ese4 passages 12 are in direct Comunication conduits 13 which extend through the'l adiacent side wall 14 of the tank 1 at a level considerably belowl the surtaceoi the` rlass the tank`as best shown in Fig. l. (rates or closures 15, slidable vertically through conduits 13 and regulated by adjusting screws 16, serve'to'regulate the ilow of glass through conduits 13 into the container ll.

As shown in Figs. 1, 2 and 3, short verticall extending `]gartitions,17, rising from the ottonpof container a, limit the two ends of the sheet forming area of glass in con tainer 1 iand define one side ofthe passages' l2 at the two sides of the container; The,

glass which flows into the container.'through passages 13 -will divide,ypart of it'litlowing in at 18 to supply the side of sheet nearestthe tank, and the remainder flowngfhrough passages 12 to the closed end of cont/ailier fl to supply the/other side et sheet (S. This insures a free and uniform supply of glass to both sides of the glass sheet.

At a is indicated the shallow ree container l1 isJ mountedabove a heating chamber or furnace l1' nasales scribed. Otherwise -this lmodification is the same as that shown in F igs. l, and 3.

In either forni of the invention the closures 15 will be so adjusted that thesupply of.

vent the lass level therein from rising to an' excessive eight. i

lt will be seen that the supply of molten glass drawn from the tank 1 is taken from a location considerably below the glass level in the tank. This will necessitate a deeper flow of glass through the tank, consequently a` greater volume of 'glass in motion and av slower Elow of the surface glass, and the glass removed and drawn. intoV sheet form will remain a longer period in' the tank than below the lowerv glass 'level in tank 1, in`

sures a constant. head of glass to supply the pool 5 and also insures a constant glass level Vwould ifo the" case ir" only the surface glass I in the pool regardless of the intermittent feeding operations at the melting end of the furnace. Also, since the flow oi' surface glass is interrupted atthe gates l5, there can be no continuous lines or other glass formations extending back from the sheet source into the furnace glass, and one possible cause of waves and irregularities in the sheet surfaces is eliminated.

I claim: f

1'. The method of drawing sheet glass,

`which consists in supplying a draw-potwith sub-surface glass from a glass melting furnace, drawing a sheet vertically therefrom, and flowing from said pot any surplus glass contained therein.

2. ln sheet drawing apparatus, a `glass melt-ing tank, a poty for containing Ymolten glass L in comnluiiicati on with the ltank, means in the tank permitting only subsurface gil'ass to ilow into the pot, means for iio" heating the glass in the pot to maintain it at l af'suitable working temperature, and a spill- 'way lor maintaining the glass in said pot at a constant level.

In, sheet glass drawing apparatus',

glass melting lank having outlets below the glass level-therein. a draw vpot in co1nmunication with theputlets. means in the outlets for controlling the flow of glass into the draw pot, a spillway for controlling the glasslevel' in the pnt. anda heated chamber surrpi'mding` the draw pot sind outlets.

The process of drawing glass, iiioliidiris l reservoir below the tapping a vglass supply therein, and causlevel ot the glass contained .ing the glass at this lower-level to llow.

to How around opposite ends of the sheet forming area to supply both sides of the glass being drawn, and causing any surplus glass to dow from said pot. Y

6. in sheet glass drawing apparatus, :i glass melting tank provided with a plurality otconduits 'positioned beneath the level of the molten glass contained therein, and adraw-pot provided with passages aligning with said conduits for causing the lassI from the tank toy flow to both sides ot 'the glass being drawn l'roni said pot.

7. ln sheet glass drawing apparatus, a' glass melting tank provided with a plurality of conduits positioned beneath the level ot' the molten glass contained therein, and a draw-pot provided with passages aligning with said said conduits for causing the glass from the tank to How to both sides of the glass being'drawn from said pot, saidpot being provided with an overflow passage for controlling the glass level therein.

8;. In sheet glass drawing apparatus, a glass melting tank provided with a plurality oi conduits p tioned beneath the level ot the molten glcontained therein, a stationary draw-pot provided with passages in direct eonin'iunication with said conduits, and means for limiting the two en'ds of the sl, iet forming area of glass' and for defining one side of said passages, said means directing the flow of glass around opposite ends of the sheet torniing arca to both sides of theglass being drawn.

9. In sheet glass drawing apparatus, a glass melting tank provided with a plurality of conduits positioned beneath the level of the molten glass rcontained therein, a drawpot provided with passages in direct coinmunication with said conduits, and means for limiting the two ends of the sheet forining` area ot glass and ior' del'iiiingone side otdsaid pas. ges, said means directing the lio-w ot around opposite ends oi the sheet forming area to both sides of thel glass being drawn, said pot being provided with an oveiiow passage for' controlling the level, therein. l ll). In sheet glass drawing apparatus', a glass melting tank provided with a plurality of conduits .positioned beneath the level of the molten` glass contained therein, a drawpot rovided with passages in direct coniinunication with said conduits, and partitions rising from the bottom of said pot l'or limiting the two ends ot' the sheet torni ing area oi: glass and lor delining one side ot' saidvpassages; said partitions directing the liow of glass around opposite ends of the sheet 'l'orniii'ig area to both sides ot the glass being drawn.

1l. ln sheet glass drawing apparatus, a glass melting tank provided with a plurality ol conduits Ipositioned l/ienggith the level of the nioiten glass contained ltherein, a drawpot provided with passages aligning with said conduits, and partitions rising from the bottoni of said pot for ,limitingthe two ends otl llie sheet iorniing area of glass and ior defining one side ot said passages, said partitions directing the flow ot glass around opposite ends of the sheet forming area to both sides -of the glass being drawn, said pot being provided with an overflow passage for controlling the glass level therein. l

l2. In sheet glass drawing apparatus, a gia melting tank provided with a plurality ot' conduits positioned beneaththe level of the molten contained therein, a draw pot i'ii'ovided with passages aligning withv said conduits, partitions rising from the bottoni ot saidv draw pot inwardly of the opposite sides thereof, said partitions limiting the two ends of the sheet forming area ot' glass and defining one side of said passages, and a heated chamber surrounding said draw-pot and passages.

13. In sheet glass drawing apparatus,` a glass melting tank provided With a plurality of conduits positioned beneath the level of the molten glass contained therein, a drawpot provided with passages aligning with said conduits, partitions rising from the bottom olf' said draw-pot inwardly of theopposite sides thereof, said partitions limiting the two ends of the sheet forming area of glass and defining one side of said passages, and a heated chamber surrounding said draw-pot and passages, said pot being provided with an overflow passage for controlling the glass level therein.

14. In sheet glass drawing apparatus, a glass melting tank provided with a plurality Ot' conduits, a draw-not provided with passages aligning and in direct communication with said conduits, means for drawing a sheet Yfrom said pot, and means for carrying away any surplus glass in said pot.

l5. In sheet glass drawing apparatus, a incltii'ig tank provided With a plurality of conduits. a draw-pot provided vWith passages aligning and in direct communication with said conduits, and means Jfor drawing a sheet i'roni the draw-pot, said pot heine; provided with an inclined overflow passage for controlling the glass level therein.

16. ln sheet glass apparatus, a draw-pot from which a sheet ot glass may lie/conisigmously dmwgm, said po being provide" )vlth a phuallty of passages' for xeewmg molten gloss fr'm a source o'f supply and l being further' provided with n. splway fol" cauyng away any surplus ass therein and par'tltmns rlsmg. from 't e bottom of said pat inwardly of the oppsitev sides thereof fOr 'miting the two ergd .di the Vsheet forming area and for denng me side pf said ,gassa'gwn Signed'at olado, in the county of Lucas,

and .stave -ofohio, this 26th day. ci "May,

JSEPH A.. .REEGEL 

